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I managed to install the 11.9 driver manually what overwrites the driver (11.8). Download the new Catalyst Driver here http://support.amd.com/, then change to the directory where the driver is located, then:

sudo sh ati-driver-installer....run --buildpkg Ubuntu/oneiric

install the *.deb's with

sudo dpkg -i *.deb

reboot. Now it should be overwritten. Gnome Shell still has graphic bugs though, but it runs.